M. Meila, and D. Heckerman. Proceedings of the Fourteenth Conference on Uncertainty in Artificial Intelligence, page 386--395. Morgan Kaufmann, Inc., San Francisco, CA, (1998)
R. Agrawal, J. Gehrke, D. Gunopulos, and P. Raghavan. Proceedings of the ACM SIGMOD Int'l Conference on Management of
Data, Seattle, Washington, page 94--105. ACM Press, (June 1998)
M. Kirsten, and S. Wrobel. Inductive Logic Programming, 10th International Conference, ILP 2000, London, UK, July 24-27, 2000, Proceedings, volume 1866 of Lecture Notes in Computer Science, page 112-129. Springer, (2000)